Relay



J. EHSGKSOM vRELAY.

APPLxcATloN FILED Auag. 19x9.

Yatente June l: 1920.

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'ELECTRXC Lemme.

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it known Atlmt l, 50H3? eiizen of @he United States of :i :zesilent of Chicago, omini; o @wie ,of ilinoiy have inveiiieel povifle a relay which may be oemeotecl im or direct current ami which Tuo-'y be im Cil "tion will be poinecl out in the eoeei ranged to opeiale with 3the diie/ot eliirem only, or which may epe'fafce in a pfirieum manner with both alteinziting @meent ajlid diiec Current.

Amotliei' object of. my invention 'ii' la@ or@ Viie e. relfajy Wl 'ci uilizes lle Whoa Home bridge 'pinoiple as .applied to Taf-hey than no electric ou'eiv imi-:ii elle armature of' miel rele) 'i 'die bei. t

the mme of lilzeaie" A fige eeh responding to the eeeive? o3" g'nlvaiiometei bridge. i d

inolgher object of in" inveiiioii to pfevide a relay' vil-liek ma 'be con :acted iro oie-- @uit 'with o. direct eurieii :Hifi Wl'iioii 'will atmot ila; imam'e momeng-:ziily when eli circuit is closed nml again only moineetoril when lie eireui is broken.

@ber femur-es zmfl objecis of my iwf-ei J:Zion by ieeriing to lh@ leeeomifai'iyini ings in. Which-- Fig. l shows one form of my impove. relay.

Fig. 2 is an end View of the relay in Fig. 1 taken from the left of seid figure.

Figi. 3 is a top View of the relay in Fig. e? Shows :mothei form my im proved relay :md ligis, 5 and G zoverre speetiiely, im end View :mil n, top View of the relay shown in Fig. 4.

l will now describe my invention more in det-ail. Referring to Figs. l, 2 nml 3, l have shown a coil 2 :moune upon au iron mounting bracket 3 et one enel by means of Shown am?. application filed August eieuif may be eomieetefl.

.Finely mouiieflbetween leupper extendv ing ends of the brackets 3 and 4r are a pair of parallel Sol iron cores er fools 9 and i0a bfaeliets 5 and of elle Sf is firmly @lashed coppe? 'il alud on the left lionel emlof the eoie is secured another coppe? 'slug i2. two eogfpel-Sluge me mounlnecl for eiiougli zigfiit io lem/'e Spacel 'for ollea'fmauie 'l which ie pivote-fl at he points 'lli' emi 15 and. held normally away il'om the cores 9 :mel ,i0 by' means of 'the oeil spring 115, thereby riminliiiiiing pail of spings 1'? and 18 normally ou@ of contact. 'At certain aimes to poiidie ou; hereina'ifter, the pole pieces 9 and. l0 will be charged :is opposite pole pieces' and. will theie'oe :att met die armriuire 13 to close the coni-:iet of Springs lf? `f ferai' which l. shown in, ii"

mi'gi'i the coil. Also lie Timm l ll be etereo ofi moiieizarily whenm over e. .flee current applied "5o Lilie Coil mil will again be momenafiiy zii. fietefl when elle direct @orient ifs iemoved imm 'the eii'oui; Seid coil. ll il be seen that 'die path lle magnetic ilu): conseil by apply ing rlieot oum'ent izo the 'indiiig of die includes the oo'e of solo, coil, alle biazcifel, il. 'the eoiee 9 and. i() iii multiple., "che piece Ll, und boel; to the core of coil 2. Well. known in the art, Tjee Coppel slugs sind iii have a. etfirfli'ng action which. egel "1st any change in the magnetic flowing in theizerespeetive eoes 9 and l() so thm when o. magnetic flux is set up :iiioi'licl the above braced circuit i s; increase Clemens@ in Strength will be opposed at iwo places. is, elle Hm; in, ille. right lmncl enel of the core 9 will be opposecl by the soumet force eet up in the slug 1l, :md 'the magnetic flux in the core 10 will be opposed in the left hand end of Said core by the commer notion of the slug l2. Thus it 'will be lmt elle miel points of the ooies 9 mirare secured byiron screws to the two' @n ille righi, lionel en@r and l will act as north and south magnetic poles and cause the arn'iature 13 to be attracted to said mid points, thereby short circuiting magnetically the two slugs ll and l2. lhc magnetic linx will now How from the core ot coil 2, braclret 3, coil l0, to the mid point thereof, armature 13, and on through the lett hand halt ol core 9, and

through pole piece l to the core of coil 2."

Ass soon, however, as the magnetic flux in the tivo cores 9 and l() has reached 'its maximum point and the counter torce generated in the singe 'l1 and '1.2 dies down, the cores 9 and l() irill lorm a tree path to the flux, and the armature 13 will tall hack. ln the saine manner when the direct current circuit through the coil i2 opened the slugs 'll and l2 will again oppose the decrease in flux in. thc two coreel 9 and l() and the armature l?, will again be momentarily attracted by the counter magnetic torce generated thereinL lt will be eeen that .l have utilixed the lllheatatone bridge principle as applied to lim: rather than electric current and that the coil and Vite core act as the battery bridge, the le'l't hand end of the core l() and the right hand end of the core 9 act as the variable arms and the right hand end of the core l() and the lett hand end ot the core 9 act as the fixed arms4 et Said bridge, while the armature i3 acts as the receiver or galvanometer arm. Therefore when the two variable arms are :hanged in resistance relative to the .fixed arms by the counter action ot the slugs, a pull is exerted on the armature 13.

New, when an alternating current is supplied to the Winding of the coil 2 it will be seen that, ae the alternating current is continually changing in direction, the magnetic flux in the cores 9 and l() will never be steady and therefore the counter force in each slug ll and l2 which is caused by a change in the flux of the cores 9 and 10, will v he maintained constant and the armature lli will therefore be held in its attracted po sition.

'.lhere'ore it will be seen that l have de vised a very eilicient and novel relay which inea, te

is adapted for many uses and which may be arranged to close an alarm circuit. or signal circuit momentarily when a direct current 'circuit i5 closed and again when it is opened and which vill not hold up on direct current.

Having fully described my invention what l desire to protect and secure by Letters Patent will be pointed out in the appended claims.

W hat I claim as my invention is:

l. ln a relay, a magnet, an armature for said magnet, means for applying direct or alternating current to said. magnet, means for causing said armature to be attracted lmomentarily when direct current is applied to said magnet and 'tor causing said armature to be permanently attracted as long as alternating current is applied to Said magnet. A

2. In a relay, a magnet, an armature for Said magnet, meanetor applying direct or allernating),` current to said magnet, means for causing said armature to be attracted momentarily when direct current is applied to Said magnet and for causing said armature to be permanently attracted as long as alternating current'is applied to said magnet, and a circuit controlled by said relay.

3. in a relay, a magnet, a magnetic circuit tor said magnet, said circuit having a portion thereof forming a Nheatstone bridge, a. pair of 'permanent arms and4 a pair of variable arms for Said bridge, an armature for said magnet, the points of said bridge between said varia-ble and permanent arms forming pole pieces :toieai'd armature, Said armature normally Iheld out ol eng 'age-A ment with said pole pieces, the other two points ot' said bridge being connected by a battery bridge comprising the core of said magnet, means for generating a magnetic flux in saidcore, and. means for varying the reluctance of said variable varms. to cause the magnetic flux to Yflow through said armature and attract the same.

Signed by me at Chicago, Cook county, llinois, this 2d day of June, 1919.

' JOHN FRCKSON. 

